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Semi-coherent zirconia inclusions in a ceramic matrix

Published online by Cambridge University Press:  31 January 2011

R. Guinebretière
Affiliation:
Science des Procédés Céramiques et Traitements de Surfaces, UMR CNRS 6638 Ecole Nationale Supéricure de Céramique Industrielle (ENSCI), 47 Avenue Albert Thomas, 87065 Limoges, France
Z. Oudjedi
Affiliation:
Science des Procédés Céramiques et Traitements de Surfaces, UMR CNRS 6638 Ecole Nationale Supéricure de Céramique Industrielle (ENSCI), 47 Avenue Albert Thomas, 87065 Limoges, France
B. Soulestin
Affiliation:
Science des Procédés Céramiques et Traitements de Surfaces, UMR CNRS 6638 Ecole Nationale Supéricure de Céramique Industrielle (ENSCI), 47 Avenue Albert Thomas, 87065 Limoges, France
A. Dauger
Affiliation:
Science des Procédés Céramiques et Traitements de Surfaces, UMR CNRS 6638 Ecole Nationale Supéricure de Céramique Industrielle (ENSCI), 47 Avenue Albert Thomas, 87065 Limoges, France
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Abstract

Nanocomposite ceramic materials were fabricated by conventional sintering of composite powders obtained by sol-gel coating of submicron powders. The microstructure of these MgAl2O4–ZrO2 materials was studied by transmission electron microscopy. All zirconia grains were in the tetragonal phase. In addition, the intragranular zirconia crystals exhibited heteroepitaxial orientation relationships with the surrounding spinel grains, (hkl)zirconia//(hkl)spinel. Semi-coherent interfaces along {111} planes were observed by high-resolution microscopy. The transformation toward the orthorhombic or the monoclinic phase retained the epitaxial relationships as far as possible. The presence of such heteroepitaxial intragranular crystals in sintered ceramic materials, which did not involve a melting stage, was attributed to the specificity of the material preparation process.

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Articles
Copyright
Copyright © Materials Research Society 2000

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